## Electronic Theses and Dissertations

1993

Thesis

M.A.Sc.

#### Department

Mechanical, Automotive, and Materials Engineering

Huynh, V. M.

#### Keywords

Engineering, Mechanical.

CC BY-NC-ND 4.0

#### Abstract

An optical method based on the laser light scattering technique for surface roughness measurement of tapered roller bearings was developed. This technique was based on an analysis of the Bi-directional Reflective Distribution Function (BRDF) of the scattering pattern from a bearing surface. A He-Ne laser $(\lambda = 0.6328\ \mu$m) was used as a coherent light source to illuminate the surface of the roller bearings. They were surface-ground and honed to obtain 1-D and 2-D surface texture in order to improve lubrication. The scattering pattern was captured by a CCD camera and then digitized by a frame grabber board on a PC-AT computer for analysis. The BRDF of the scattering pattern was obtained in order to derive the zero and second moments. These were used as the optical roughness parameters of the surface and then correlated to the mechanical root mean square (RMS) roughness and the RMS slope of the surface profile which were obtained from a stylus instrument. Correlation curves of the zero moment versus the RMS roughness and the second moment versus the RMS slope of 1-D and 2-D surface texture roller bearings were obtained separately. Good correlations were observed, and the curves showed the relationship between the optical roughness parameters and the mechanical roughness parameters. The normalized zero and second moments correlation curves were also obtained and these curves for 1-D and 2-D surface texture roller bearings coincided. The possible error of this optical measurement technique was determined to be less than 10%. Source: Masters Abstracts International, Volume: 32-06, page: 1698. Adviser: Van-Minh Huynh. Thesis (M.A.Sc.)--University of Windsor (Canada), 1993.

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